Protector-slide for door-locks



` UNITED sTATEs PATENT oEEioE.

G. F. J. COLBIJRN, OF NEWARKQNEV JERSEY.

PROTECTOR-SLIDE FOR DOOR-LOCKS.

Specification of Letters Patent No. 6,142, dated February 27, 1849.

To all whom t may concern:

Beit known that I, GEORGE F. J. CoL- BURN, of the city of Newark, county of Essex, and State of New Jersey, have invented a new and improved mode of preventing locks from being picked, which also secures the key in the lock, renders the latch stationary, thereby acting as an additional bolt, or admits of its being used as a night or dead latch if required; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making part of this specification, in which- Figure A is an inside View of the slide; Fig. B an outside view of the slide, Fig. C a view of the cap of the lock, with the knob spindle removed to show the method of attaching the slide by the standard 7c inserted in the cap, also to show the aperture made in the back rim at N to receive the slide and the position of the key hole Jfor a dead latch at G. Fig. D shows the application of the slide to the lock and the method of retaining it by the nut O, applied to the thread cut on the standards, also the application of the slide to the head of the key and to the knob spindle, which operations are further exhibited in the sectional Figs. E and F. Fig. G shows a square filed upon the pin of the key upon which the slide acts fto prevent its being turned or withdrawn.

Fig. H'shows the simple form of night key required and Fig. I the interior of the lock with the night key operating on the latch y pushing the slide.

at M, the spindle being made stationary by Fig. J is a perspective view of the lock with the slide drawn out, the spindle and key freed from the operation of the slide.

The nature of my invention consists of attaching to the cap of the ordinary rim lock a movable slide of brass or iron, having an oblong aperture in the middle made to clasp the spindle, the end of the slide being widened on the lower side, to cover the key hole, and notched in square on the end to clasp the pin of the key, the slide being shoved in, the spindle, key and key hole, are locked, defying the burglar from without.

To enable others to make and use my invention I thus describe its construction and operation.

I take an ordinary rim lock of any size and cut a piece out of the back rim on a line with the spindle down flush with the cap, of a size proportioned to the slide and spring as shown at 7L., Fig. C. Near the centerl of the cap as at k, Fig. C, I attach a small standard having a thread cut on the end to receive a nut o, Fig. D, which retains the slide. I make the slide of any hard metal of suiiicient length, tocover the key hole, and to project an inch beyond the back rim of the lock, the projecting end being turned out for a handle as shown in Fig. A. Upon the under side of the handle end I make a rebate to stop against the bottom of the aperture, in the back rim, when the slide is drawn out. And to the upper edge of the slide, I attach a steel spring with a thumb catch to stop against the upper part of the aperture, when pushed in, thereby securing its position as being detached from or as operating upon the latch and key. I cut an oblong aperture in the slide to fit a square filed into the knob spindle, which it clasps, and prevents from being turned as shown at Fig. F. Vhen the slide is pushed in this aperture is enlarged in the center as shown at Fig. A, 'B for the easy admission of the spindle, and to allow it to turn free from the operation of the slide when drawn back. If desired a square may be filed upon pin oi the key, as at Z Fig. Gi and a corresponding square opening cut on the end of the slide to clasp the key, Figs. E, and D the bow of the key being turned perpendicular with the key hole or parallel with the slide, preventing its being turned or forced out of the lock when the slide is pushed in, or the end of the key may be cut of? and the entire key hole be covered by the slide.

The application of the dead latch is effected thus, the slide being pushed in clasps the knob spindle rendering it immovable andthe key hole is closed upon the outside, but the latch remains free to be operated upon by a simple key as shown at m Fig. I which may be applied by merely cutting a key hole in the cap and inserting a drill pin in the bottom of the lock as at Fig. C, thereby combining the advantage of a dead latch with the ordinary lock at a trifling expense.

That I claim as my invention and desire to secure by Letters Patent is- The application to the ordinary rim lock of a metal slide which Will at the saine time position rendering it inoperative upon the cover the key hole protecting the lock from latch, thereby converting the latch into an being picked or opened from the outside; additional bolt.

to preventthe key from being turned by GEORGE F. J. COLBURN. 5 the application of instruments to the pin fitnessest or itsJ dropping out by the slamming of the AARON O. BOYLAN,

door and retain the knob spindle in a Xed A. G. PLINY COLBURN. 

